rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=6673, q=52 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294953864-4294943362), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g6673 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5810 Comm: syz-executor400 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:signal_setup_done+0x0/0x310 kernel/signal.c:2946
Code: ff 89 da 80 e2 07 80 c2 03 38 ca 0f 8c 17 fd ff ff 48 89 df 89 c5 e8 af d8 88 00 89 e8 e9 06 fd ff ff 0f 1f 84 00 00 00 00 00 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 41 89 d6 49
RSP: 0018:ffffc9000478fd78 EFLAGS: 00000246
RAX: a61ad9a3c87f1e00 RBX: 1ffff920008f1fb4 RCX: a61ad9a3c87f1e00
RDX: 0000000000000000 RSI: ffffc9000478fde0 RDI: 0000000000000000
RBP: ffffc9000478fec0 R08: ffffffff8e4a8e2f R09: 1ffffffff1c951c5
R10: dffffc0000000000 R11: fffffbfff1c951c6 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc9000478ffe8
FS:  000055557a53d3c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000bbdffc CR3: 0000000024219000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 handle_signal arch/x86/kernel/signal.c:285 [inline]
 arch_do_signal_or_restart+0x4a6/0x7b0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa462e75dd0
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d da 29 03 00 e8 c5 06 fb ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fff7d555eb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fa462e4f8d9
RDX: 00007fff7d555ec0 RSI: 00007fff7d555ff0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007fa462e0f990 R09: 00007fa462e0f990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa462ead33c
R13: 00007fa462ea7106 R14: 00007fff7d556490 R15: 0000000000000000
 </TASK>